Finding the Fourth Proportional to 12,152.17, 18,243.31 and 7,979.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,152.17 : 18,243.31 = 7,979.12 : x
2. Step 2: Convert to fraction form
   12,152.17/18,243.31 = 7,979.12/x
3. Step 3: Cross multiply
   12,152.17x = 18,243.31 × 7,979.12
4. Step 4: Simplify right side
   12,152.17x = 145,565,559.69
5. Step 5: Solve for x
   x = 145,565,559.69/12,152.17
6. Step 6: Final answer
   x = 11,978.57